.nav{
	position: relative;
	width:100%;
	background: #6BDBD0;
	border-bottom:1px solid #ccc;
	font-size:0;
	
}
.nav a.active{
	background:#ccc;
}
.header_div{
	height:0;
	padding-top:16%;
	box-shadow: none;
}
.nav a{
	text-decoration: none;
	display:inline-block;
	padding:2% 0;
	width:50%;
	text-align: center;
	color:#000;
}